Telephone system



Oct. 1, 1929. F. LUBBERGER 1,729,852

TELEPHONE SYSIEI Original Filed April 9,1926 3 Sheets-Sheet 1 Ffil?Lubberger 1929. F. LUBBERGER rznaraonz svsma Original Filed A ril 9,1926 2 v \Km 1m FI TZE Lubber' E1 Patented Oct. 1, 1929 @NITED STATESFFlCE FRITZ LUBBERGEB, OF BERLIN, GERMANY, ASSIGNOR To SIEMENS & HALSKEAKTIEN- GESELLSGHAFT, OF WERNEBWEBK, SIEMENSS'IADT, NEAR BERLIN, GERMANY'rnnnrnoun sYs'rEm 1 Application filed April 9, 1926, Serial No.100,803, and in Germany May 27, 1925. Renewed May 11, 1929.

The invention relates to a circuit arrange ment for automatic telephonesystem wlth impulse storers, and its particular object is to reduce to aminimum, consistent with re- 5 liable working, the number of impulsestorers required for building up speech connections in a telephoneinstallation.

Systems are known in which all the number impulse receivers for a speechconnection are not positioned in conjunction with an impulse storer, andin which one or more of the trains of impulses transmitted by thecalling party directly operate the number impulse receivers. If thenumber impulse receivers, which are to be directly operated, be locatedat the initial stages of the speech connection, in the knownarrangements the connectin up of the impulse storer is efiected beyond tese number impulse receivers. According to the re invention, thequantity of impulse storers is reduced by connecting them up at a pointlocated in front of the number impulse receivers that are directlyoperated. According to the invention switching means are provided,auwhereby the impulse receiving devices of a storer cannot be operateduntil the trains of impulses transmitted by the calling party haveoperated the number impulse receivers which are to be directly operated.

The impulse for connecting up an idle impulse storer can be given assoon as the con necting up point has been taken into use. Butalternatively according to the invention it can also be given when thecalling party transmits the particular train of impulses which precedesthe first train of impulses that operate the storer. The latterarrangement effects a greater reduction of the'quantityof impulsestore-rs, because no impulse storer is withdrawn from the general traficduring the time between the taking into use of the junction point andthe functioning of the last train of impulses that directly operates anumber impulse receiver.

According to the invention, the installation is further simplified andcheapened because the impulse receiving relays,,whichbring about thedirect positioning of the number impulse receivers, also eiiect thepositioning of the impulse receiving devices of the storer.

tion are not shown.

.is accessible in the banks of the preselector HVW and is positioned byinterrupting the loop at the subscribers station, while the switches inthe succeeding stages are controlled by the impulse storer (shown inFig. 2) by means of earth impulses over the 0; leal and the applicationof battery to the b Fig. 3 shows a modified part of the circuit given inFig. 1 which enables the impulse for 1 connecting up an idle impulsestorer to be combined with the commencement of the first train ofimpulses.

Let the subscribers number have five digits. The first train of impulsespositions the first group selector, while the succeeding trains ofimpulses are first of all stored and are then transmitted to thesucceeding switches after being translated if necessary.

The first group selector lGW has lifting and rotary motion. The secondpreselector HVW is or known construction. DD indicates a senderselector, which here is permanently associated with the first groupselector. It forms a rotary switch with 25 positions and is of the knowntype of step-bystep rotary switch. The impulse sender Z is of knowntype; its wipers rotate over the Y six discs A 1-A 6 when they arecoupled to a continuously rotating shaft, which is not shown, this beingeilected when a coupling magnet K is operated. SP (8;) 1-4) indicatesthe storers, which comprise ten-point rotary stepping siwltches. As theinvention does not concern the known devices, but deals with therelationships mentioned in the preamble, the switching devices, requiredfor returning the storers to their normal posi- ST indicates the sideswitch for the storer, which likewise is constructed after theprincipleof the rotary stepby-step switch. The arrangements for movingon these switches to their normal position after the release are knownand are therefore not shown. The circuit changes forming part of theinvention can be followed on the drawing.

Seizure of the first group selector When the second preselector ispositioned, the relay is operated in the following circuit: earth atthesecond preselector, 0 lead, contact 1 m,- relay C, contact 2 n,battery, earth. At its contact 3 c it prepares the test circuit of thefirst group selector, and closes at the contact 4 o the circuit formoving on the sender selector DD as follows: earth, contact 4 0, contact5 f, contact, 6'pd, motor magnet Dd, contact 7 dd, battery, earth.

Positioning the sender selector Positioning the first group selectorAfter the first grou selector has been taken into use by the seconpreselector, the relays A and B are operated over the subscribersinstrunient. The rela A at its contact 11 d energizes the slow actingrela V over earth, contact 11 a, slow acting re ay V, battery, earth,and at the contact 12 v repares the circuit of the relays U and I. erelay A is deenergized each time the loop is opened at the number dial(for example when dialling the number 3), and at the contact 1411 thefollowing circuit is closed: earth, contact 14 a, contact 12 '0, slowacting rela U,'relay I, battery, earth. The relay I pu sates and at eachim ulse closes the clrcuit of the lifting magnet over earth, contact 15i, contact 16 w, lifting magnet H, battery, earth. The group selectorraises its wipers in accordance with the impulses transmitted. The slowacting relay U is operated at the first lifting impulse and holds itselfoperated during the impulse transmission. At the end of the impulsesrelay U falls back and closes the circuit of the rotary magnet asfollows: earth, battery, rotary magnet D, contact 17 d, contact 18 'v,contact 19 n, contact 20 p, contact 21 h,

earth, this circuit having been previously prepared at the contacts 18iv and 21 h. The group selector rotates until the test relay P isoperated in the test circuit: earth, contact 3 0, relay P, test lead0'', earth at the second group selector (not shown). It then opens thecircuit of the rotary magnet at the contact 20 p and at the same timeshort circuits its high resistance winding at the contact 22 p,

thereby reventing the second group selector being ta en into use foranother call. The contacts 23 p and-24 switch through the speakingleads, and t e contact 25 p preares the circuit for positioning thestorer.

uring the positioning of the first group se- -v lector, the senderselector has in a reliable manner found an idle impulse sender.

Positioning the storer During the second impulse train, for example,when dialling the number 3, the relay I pulsates in the known manner,and at the contact 26 i, it closes the positioning circuit for thestorer Sp 1 over: earth, contact 26 i, contact 25 p, sender selectorwiper dd 3, slow acting relay Q, rotary magnet DSp 1, battery, earth.The wiper sp 1 is brought onto the third contact. Relay Q is o erated bythe first impulse and energizes t e side switch magnet ST in thefollowing circuit: earth, contact 56 g, magnet ST, battery, earth. Atthe end of the train of impulses the relay Q falls back and opens thiscircuit, the side switch then moves into the position 2. The furthertrains of impulses (third to fifth) in succession position the wipers sp2-sp 4 according to'the selected numbers such as 5, 7, 9. After thefifth train of impulses, the side switch reaches the position 5. The

opening of the rotary ofi normal shaft contacts 16 w preventsthesetrains of impulses aflectingthe lifting magnet H. 4

Translation In this example the subscriber has dialled the number33579.. But the switches, instead of being positioned according to thisnumber, are to be positioned according to the number 34957 9. Thisrenders it necessary for the storer to effect a translation, this beingdone with the assistance of the intermediate distributor ZV. Thisdistributor has the soldering tab at 11 permanently earthed, the othertabs being connected to corresponding contacts on the storers. Theintermediate distributor has its second row of soldering tabs connectedto the corresponding terminals in the contact rows I, II,

III, IV, V of the disc A 3 of the impulse sender. The disc A 3 has aspecial contact VI in frontof the first contact row I which is connectedto a key Ta at the intermediate distributor. In. the present case thiskey. is

not closed. The tab so 11 is connected b a jumper wire to the fourthsoldering-tah in the row I. The soldering tabs in the row II have thejumper wires irregularly connected in accordance with the translation tobe effected; for example, in the present case the storer contact 3 isconnected to the impulse sender contact 9. The other rows of solderingtabs are connected to the corresponding contacts. If, however, atranslation is also required here, the jumper wires would have to beirregularly connected.

The impulse sender The impulse sender that is here shown has 6 discs A 1to A 6; The disc A 1 comprises an earthed ring, which is open at thepoint where the wiper is in its normal position. The disc A 2 has 5segments I-V. In its normal position the wiper A 2 touches the segmentI. The gaps between the segments are so large that the switches caneffect the non-numerical selection while the wipers of the impulsesender are moving over the gaps. The discA 3 has 5 rows of contacts. Thegaps between these rows are as large as those between the segments onthe disc A 2. In

- front of the first contact row on the disc A 3 there is the contactVI, which, as stated above, is connected to the key Ta. Its purpose willbe explained hereafter, The disc A 4 is divided into 5 segments, whichare connected to battery over a resistance W 2, and have gaps of thesame size as they discs A 2 and A 3. The disc A 5 comprises 5 earthedsegment-s, each of which has a row of 10 contacts wiped over by thebrush A 5.

' This brush only touches the contacts, so that each time anothercontact is reached, the outgoing a lead is earthed. The gaps between.the contacts interrupt the earth, thus creating the current impulses.The sub-division on the disc A 6 is such that the segments I and II andalso IV and V, corresponding to the other discs, are interconnected, sothat there are altogether 3 gaps, which are so small that they can bebridged by the wiper A 6. The wiperA 6 moves from the segments 1-H andIII to the succeedingsegment before the other wipers A 2 to A 5 reachtheir segments III and IV. The arrangement is required for theoperations to be described later on to dealwith irregularities inoperating the number dial.

It will be assumed that the sender is arranged to start up after thestorer has been positioned and that the subscriber has positioned thestorers 8p 3' and 8p 4 while the impulse sender is moving over thesegments 1- II. After the storer sp 2 has been positioned, the sideswitch ST moves into its third position in the manner described above.In the position 3 the starting relay An 3 is energized over the sideswitch arm St 2 in the circuit: earth, side switch arm at 2, position-3, relay An 3, battery, earth. Relay An '3' arrow. The wiper A 1 movesover the earthed disc and closes the following circuits: earth,

battery, relay Td, sender selector armdd 2, Wiper A 1, earth; and earth,battery, relay An 3, winding II, contact 28 an 3, wiper A 1,

earth. The relay Td is operated in the first mentioned circuit, and atits contacts 29 tn? and 30m it connects the impulse sender t6 thespeaking leads, while at its contact 31 td it energizes the slow actingrelay G: over:

earth, battery, slow acting relay G, contact a tact 24 p, I)" lead. Thewiper A 5 moves over the, contacts and at each contact it sends apositive impulse over the a. lead asfollows: earth, contact 32 7", disccontacts for A 5, wiper A 5, sender selector arm dd 5, contact 30 tel,contact 23 1), lead a". As soon as the wiper A 3 reaches its fourthcontact in the row I, the relay R is energized over: earth, battery,relay R, wiper A 3, contact 4 and soldering tab 4 of the side I of theintermediate distributor, jumper lead, soldering tab so 11, earth. Therelay R locks itself over the cont-act. 33 1" in the following circuit:earth, battery, relay R, contact 33 '1', wiper A 2, segment I of thedisc "A 2, earth, and at the contact 32 1' it opens the impulse circuit.When the wiper A 4 leaves the segment I, the steering current circuit isinterrupted and the switch commences its non-numerical selection. At thesame time the wiper A 2 leaves its segment I and opens the lockingcircuit. for the relay R, hence the contacts 32 1- and 33 r resume theirnormal position. During the movementover the segment II, the

rela R is operated when the wiper A 3 reac es the ninth contact over thefollowing circuit: earth, battery, relay R, wiper A 3, I

' contact 9;in the contact row II, contact 3 of the storer sp 1, earth.The .above described circuit changes are then repeated for the otherdigits.

' It shouldlbe noted that in the positions 4.

themselves over the wiper A 1. Relay An 4 at its contact 34 and 4 closesthe gap between the segments 1-H and III of the disc A 6,'and the relayAn 5 at its contact 35 an 5 closes the gap between the segments III andIV-V. It has already been menare not large' so-that they can be bridgedby the wiper, hence the coupling magnet K ret-ioned that the .gapsbetween the segments mains energized during the entire rotation of thewiper until the release of the impulse sender. At the end of a completerotation of the impulse sender the wiper A 1 leaves its disc, and thiscauses the relays An- 3, An 4, An 5'to fall back. At this moment thewiper A 6 .leaves its segment IV-V. The coupling magnet K is deenergizedwhen the relay An 3 falls back and opens the contact 27 an 3, hence uponreaching its normal position, the impulse sender remains therein. Thewiper A 1 also opens the locking circuit of the relay Td which fallsback and so .closes the circuit. of the relay F over: earth, contact 9pd, contact 37 id, contact 36 g, relav F, battery, earth. Relay Foperates and locks itself over: earth, battery, relay F, contact 38 f,contact 4' c, earth. At the contact 5 f the circuit for moving on thesender selector is opened, and at the contact 8 f the test'circuit ofthe sender selector is opened. Hence the latter remains at rest untilthe end of the connection. On

falling back, the relay TD at its contacts 38 td and 39 td switchesthrough the speaking leads, thereby setting up the speech connection.After a. little while the slow acting relay G falls back. After therelease magnet MS has been deenergized the impulse storer SP and theimpulse sender Z are ready to be again taken intouse.

Release I In order to release the switches, the calling subscriber hangsup his receiver, thereby deenergizing the relay A'. At the contact 11 a,the relay V is deenergized and after the slow acting relay V has fallenback and relay U, being momentarily energized, has fallen back, thecontact 39 o closes the circuit of the release magnet M over: earth,contact 14 a, contact 39 1), contact 46 11., off normal contact 13 k,release magnet M, battery, earth. At contact 1 m the release magnetmomentarily opens the 0 lead going to the second preselector, hence thepreselectors are releasd in known mannerand the-relay G can fall back.The outgoing 0" lead is interrupted at the contact'3 0, therebyinitiating the release of the succeeding switches. The relay F isdeenergized at the contact 4 0, this renders the sender selector DDready to be again taken into use.

Emceptz'onal opemto'ns The subscriber makes a pause between thepositioning of the second and third storer. The side switch goes intoits position 3 after I the storer sp 2 has been positioned, therecontact34 an 4 has not 'yet been closed and the coupling magnet therefore isdeenergized. If in the mean time the subscriber has positioned thestorer 8p 3, theside switch goes, into the position 4 and energizes therelay An 4, hence the segment III of the disc A 6 is earthed over thecontact 34 an 4, the coup-' ling magnet is then operated and causes theimpulse sender to move on again. In a similar manner theimpulse senderawaits the positioning of the fourth storer.

No further impulses are to be transmitted if the calling subscriberprematurely hangs up his receiver, the object being to prevent asubscriber being called when there is no calling subscriber at the otherend. It will be assumed that the calling subscriber hangs up hisreceiver after he has positioned the first two storers, hence the relay0 is'deenergized as already described when the first group selector is.released. Thereby the relay P is deenergized at the contact 3 a, and itopens the contacts 23 p, 24 p, hence no further impulses can betransmitted over the lead. At the contact 40 0 the relay N is energizedover: earth, battery, relay N, contact 41 id, contact 40 c, earth. Atits contact 2 n, the relay opens the incoming 0 lead, hence the firstgroup select-or cannot be taken into use before the relay N ,has beenagain deenergized. Relay N, by closing the contact 43 n, connects aresistance over contact 42 td in parallel with the release magnet MS.Although 'the impulse sender remains guarded (relay Pd remainsenergized), nevertheless, the release magnet MS is shunted to such anextent, that it releases and in known manner causes the side switbh STto move onwards into its normal position. During the onward movementinto this position, the relays An 4, An 5, which have not yet beenenergized, are energized, hence the coupling magnet K ensures a completerotation of the impulse sender. On reaching its normal position thewiper A 1 leaves its disc, and the relay Td falls back, whereupon therelay F is mo-' If the calling subscriber has selected the first numberand then hangs u his receiver,

an impulse is sent to the impu se storing device of the impulse senderwhen the subscriber hangs up. The relay Q, is thereby energized and isthen deenergized, hence the side switch reaches the position 2. Afterthe release of therelay V, the release magnet is energized when the slowacting relay U has fallen back and has closed the followingreleasecircuit: earth. contact 14 aycontact 39 0, contact 46 u, ofinormal contact 13 70, release magnet M, battery, earth. The operation ofthe release magnet M causes the release of the switches in the manner described above. The slow acting relay Q has sufiicient time to fall back;because it can do so in the total time taken for the slow acting relay Uto fall back, for the delayed operation of the release magnet M and forthe release of the switch (IGW). After the release of the groupselector, the relay Q, receives another impulse over the followingcircuit: earth, battery, motor magnet DSp 2, side switch arm at 1position 2, relay Q, sender selector arm'dd 3, contact 49 p, ofi normalcontact 48 In, contact 47 m, earth. This circuit is immediately openedagain, and the side switch reaches the position 3. The

impulse sender is started up and makes. a

complete rotation. Relay Tel is operated. All the operations'forreleasing the returning to normal are effected in the manner aireadydescribed.

If the number of digits in the calling number is not to be alteredduring translation, then the impulse transmission by the seg- 'ment I ofthe disc A 5 must be suppressed.

To do so, the key Ta at the intermediate-distributor is actuated,thereby earthing the contact VI of the disc A 3. Hence the relay R isenergized already when the wiper A 3 passes over the contact VI, thecircuit extending over: earth, key Ta, contact VI, wiper A 3, relay R,battery, earth. At contact 32 r earth is disconnected from the disc A 5,hence the impulse transmission of the changes in the operations of thesender selector and storer.- It is only necessary toalter the circuit ofthe group selector in the drawing. The impulse bridge for examplereceives the following impulse transmission from the repeater at thefeeding bridge of the calling station; positive impulses over the a leadfor positioning the switch'esand the application of battery. to the 6lead for steering them. The release has to be made dependent on the Crelay at the incoming a lead. Such circuits are known. Hence it ispossible to insert the same sender selector and impulse sender at anydesired point in the building up of a connection.

The impulse storer can also be associated with the first group selectoralthough more than one train of impulses are used for di-'senderselector does not hunt for an impulse storer until thecommencement of the nu merical selection, which serves to position. thefirst group selector. A relay S has to be added; its circuit is preparedatthe contact t 0 when the first group selector is taken into use, andit is closed as follows when therelay U is operated at the commencementof the impulse transmission: earth, contact a 0' contact a, relay S,battery, earth. Relay-S is operated, it looks itself over contact .1 s,and starts up the sender selector DD by closing the motor magnet circuitat 2 s over: earth, contact 2 8, contact 5 7"" contact 612d, rotarymagnet Dd, contact if dd, battery, earth. Thus thecontacts 2 s and 3 8take over the functions of the contacts 4: c and 40 c in the Fig. 1. Allthe other functions remain the same as in Fig. 1.

What is claimed is:

'1. In a telephone system, a trunk line, an

'automatic switch terminating said trunk,

line, a plurality of registers, switching mechanism for associating anidle register with said trunk line, means for sending series of impulsesover said trunk line, means for operating said switch responsive to oneseries of impulses sent over said trunk line, means responsive to thecommencement of the operation of said automatic switch for operatingsaid-switching mechanism to associate an idle register with said trunkline, and means for rendering said register effective to register otherseries of impulses sent over said trunk line. I

2. In a telephone} system, a trunk line, a train of automatic switches,a register sender, switching mechanism tor associating said registersender with said trunk line,

means for sending impulses over said trunk 4 line, means for operatingone of said automatic switches in said train directly responsive toimpulses sent over said trunk line, means for operating said switchingmechanism, means for rendering said register send- 1 119 er effective tore 'ster other im ulses sent over said trunk km, the operation of saidother switches in said train being then controlled by impulses sent-oversaid trunk line by said register sender, and a line relav for Icontrolling the operation of said one 0 said automatic switches and saidregister sender.

3. In a telephone system, a trunk line, a train of automatic switches, aregister sender temporarily associated with said trunk line forregistering and retransmitting currentimpulses, said register senderbeing normally inefiective, means for sending a plurality of seriesofimpulses over said .trunkline,"

means responsive to one series of impulses for operating one of saidswitches, means responsive 'to said operation for rendering.

said register sender efiective to register the other series of impulses,and means in said register sender for transmitting a'difie'rent numberof series and a difierent number or impulses in each series, to operatethe other switches in said train.

4. In a telephone system, an automatic.

switch, a relay in said switch, a register sender associated with saidswitch, an impulsin circuit including contacts on said relay oroperating said switch, and an impulsing circuit including other contactson said relay for the positioning magnets ,of said 1o register sender.

5. In a telephone system, a trunk line, an automatic switch terminatingsaid trunk line, registers, means for sending series of impulses oversaid trunk line, means for directively operating said switch responsiveto and in accordance with one series of impulses sent over said trunkline, switching mechanism for associating an idle register with saidtrunk line, means responsive to the commencement ofv the sending of saidone series for starting the operation of said switching mechanism, andmeans for renderautomatic switch, means for sending iming the associatedregister effective to register other series of impulses sent over saidtrunk .line.

6. In a telephone system,a trunk line extending to an automatic switch,means for operating said switch responsive to a series of directiveimpulses transmitted over said trunk line to extend a connection towardsa called line, a group of registers, and means responsive to the firstimpulse of said series for selecting an idle register and connecting itto said trunk line.

7 In a telephone system, a trunk line, means for sending impulses oversaid "trunk line, a register normally disconnected from said trunk line,and means responsive to the being operated to select an idle registersender, means for then registering the remaining digits of the callednumber on the selecte register sender, and means for thereafteroperating the remaining switches in said train under the control of saidregister sender.

In witness whereof, I hereunto subscribe my name this 18th day of March,A. D. 1926.

FRITZ LUBBERGER.

first impulse of one series of impulses sent 7 over said trunk line forconnecting said register to said trunk line;

8. In a telephone system, a trunk line, an

pulses over said trunk line, a second trunk line, means responsive tocertain impulses for directly operating said switch to connect the firsttrunk line with the second trunk providing the second trunk line is-Idle, a register sender forregistering other impulses regardless ofwhether. or not the first trunk line has been connected with said secondtrunk line, and other switches 'con-

